Aufwuchs

Aufwuchs (German `surface growth` or `overgrowth`) is the collection of small animals and plants that adhere to open surfaces in aquatic environments, such as parts of rooted plants. In both marine and freshwater environments, algae – particularly green algae and diatoms – make up the dominant component of aufwuchs communities. Small crust...
Found on http://en.wikipedia.org/wiki/Aufwuchs

Aufwuchs

A German term that is used to refer to Algae growing on rocks, driftwood, etc. If not excessive it can be decorative and provides food for some types of fish and Inverts.
Found on http://www.aquahobby.com/articles/e_glossary.php
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